I need to draw some diagrams of the combat grid and miniatures for our combat system. I believe I need an illustrator program to do this. But we can't afford adobe illustrator. I have INdesign and GIMP. Does anyone know where I can get an inexpensive or free illustrator program that can handle this task.

AutoREALM is for PC, and it's a pretty neat mapping program. It's for PC.

For more general vector drawing, you might try the free DrawPlus 4 (or the $10 DrawPlus 6).

For diagrams, the Draw component of OpenOffice is actually pretty good.

Dia is also meant for diagrams. I tried it a few years back and abandoned it in favor of OpenOffice Draw because I couldn't figure out how to label the connections between boxes. That might be fixed now.